<!-- 课程大纲 -->
<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="2" process-status="wait" align-center style="margin-bottom:40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>

    <el-button type="text" @click="openChapterDialog">添加章节</el-button>
    <!-- 章节 -->
    <ul class="chanpterList">
      <li v-for="chapter in chapterVideoList" :key="chapter.id">
        <p>
          {{ chapter.title }}
          <span class="acts">
            <el-button type="text" @click="openVideo(chapter.id)">添加小节</el-button>
            <el-button type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
            <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
          </span>
        </p>

        <ul class="chanpterList videoList">
          <li v-for="video in chapter.children" :key="video.id">
            <p>{{ video.title }}
              <span class="acts">
                <el-button type="text" @click="openEditVideo(video.id)">编辑</el-button>
                <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>

   <div>
     <el-button @click='previous'>上一步</el-button>
     <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
   </div>


   <!-- 添加和修改章节表单 -->
   <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
     <el-form :model="chapter" label-width="120px">
       <el-form-item label="章节标题">
        <el-input v-model="chapter.title"/>
       </el-form-item>
       <el-form-item label="章节排序">
        <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
       </el-form-item>
     </el-form>
     <div slot="footer" class="dialog-footer">
       <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
       <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
     </div>
   </el-dialog>

   <!-- 添加和修改课时表单 -->
   <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
     <el-form :model="video" label-width="120px">
       <el-form-item label="课时标题">
        <el-input v-model="video.title"/>
       </el-form-item>
       <el-form-item label="课时排序">
        <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
       </el-form-item>
       <el-form-item label="是否免费">
        <el-radio-group v-model="video.isFree">
           <el-radio :label="true">免费</el-radio>
           <el-radio :label="false">默认</el-radio>
        </el-radio-group>
       </el-form-item>

       <el-form-item label="上传视频">
         <el-upload
             :on-success="handleVodUploadSuccess"
             :on-remove="handleVodRemove"
             :before-remove="beforeVodRemove"
             :on-exceed="handleUploadExceed"
             :file-list="fileList"
             :action="BASE_API+'/eduvod/video/uploadAlyVideo'"
             :limit="1"
             class="upload-demo">
           <el-button size="small" type="primary">上传视频</el-button>
          <el-tooltip placement="right-end">
           <div slot="content">最大支持1G，<br>
              支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
              GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
              MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
              SWF、TS、VOB、WMV、WEBM 等视频格式上传
            </div>
           <i class="el-icon-question"/>
          </el-tooltip>
         </el-upload>
       </el-form-item>
     </el-form>
     <div slot="footer" class="dialog-footer">
       <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
       <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
     </div>
   </el-dialog>

  </div>
</template>

<script>
import chapter from '@/api/edu/chapter.js'
import video from '@/api/edu/video.js'
export default{
  data(){
    return{
      saveBtnDisabled: false,
      saveVideoBtnDisabled: false,
      courseId: '',				//课程id
      chapterVideoList: [],		//章节和小节的集合
      chapter: {            //封装章节的属性
        title: '',
        sort: 0,
        courseId: ''
      },
      dialogChapterFormVisible: false,    //添加章节是否显示
      dialogVideoFormVisible: false,      //添加小节是否显示
      video: {
        id: '',
        capterId: '',
        courseId: '',
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: '',
        videoOriginalName: ''
      },
      fileList: [],//上传文件列表
      BASE_API: process.env.BASE_API // 接口API地址
    }
  },
  created(){
    //获取路由的id值
    if(this.$route.params && this.$route.params.id){
      this.courseId = this.$route.params.id;
      this.getChapterVideo();
    }
  },
  methods:{
/*==================================== 小节操作 =============================================*/
    //删除之前的方法
    beforeVodRemove(file){
      return this.$confirm(`确定要移除${file.name}？`);
    },
    //删除之后的方法
    handleVodRemove(){
      //调用接口删除
      video.deleteAlyVideo(this.video.videoSourceId)
        .then(res => {
          this.$message.success('删除视频成功');
          //清空视频相关数据
          this.video.videoSourceId = '';
          this.video.videoOriginalName = '';
          //文件列表清空
          this.fileList = [];
        })
        .catch(err => {
          console.log(err);
        });
    },
    //上传视频之前的方法
    handleUploadExceed(){
      this.$message.warning('想要重新上传视频，请先删除已上传的视频');
    },
    //上传视频成功调用的方法
    handleVodUploadSuccess(response, file){
      this.video.videoSourceId = response.data.videoId;
      this.video.videoOriginalName = file.name;
    },
    //删除小节
    removeVideo(id){
      this.$confirm('此操作将永久删除该章节记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'})
          .then(() => {
            video.deleteVideo(id)
              .then(res => {
                this.$notify({
                  title: '删除小节成功',
                  type: 'success'
                });
                //刷新页面
                this.getChapterVideo();

              });
          })
          .catch(err => {
            console.log(err);
          });
    },
    //修改章节弹窗
    openEditVideo(id){
      this.dialogVideoFormVisible = true;
      //修改数据回显
      video.getVideo(id)
        .then(res => {
        });
    },
    //添加章节弹窗
    openVideo(chapterId){
      this.dialogVideoFormVisible = true;
      this.video = {
        id: '',
        capterId: '',
        courseId: '',
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: ''
      }

      //设置章节id
      this.video.chapterId = chapterId;
    },
    //添加小节
    addVideo(){
      //设置课程id
      this.video.courseId = this.courseId;
      video.addVideo(this.video)
        .then(res => {
          //关闭弹框
          this.dialogVideoFormVisible = false;
          //提示信息
          this.$message({type: 'success', message: '添加小节成功'});
          //刷新页面
          this.getChapterVideo();
        });
    },
    updateVideo(){
      video.updateVideo(this.video)
        .then(res => {
          //关闭弹框
          this.dialogVideoFormVisible = false;
          //提示信息
          this.$message({type: 'success', message: '修改小节成功'});
          //刷新页面
          this.getChapterVideo();
        });
    },
    //添加或修改小节
    saveOrUpdateVideo(){
      if(!this.video.id){
        this.addVideo();
      }else{
        this.updateVideo();
      }
    },
/*==================================== 章节操作 =============================================*/
    //删除章节
    removeChapter(chapterId){
      this.$confirm('此操作将永久删除该章节记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'})
          .then(() => {
            chapter.deleteChapter(chapterId)
              .then(res => {
                this.$notify({
                  title: '删除成功',
                  type: 'success'
                });
                //刷新页面
                this.getChapterVideo();

              });
          })
          .catch(err => {
            console.log(err);
          });
    },
    //修改章节弹窗，数据回显
    openEditChapter(chapterId){
      this.dialogChapterFormVisible = true;
      //调用接口
      chapter.getChapter(chapterId)
        .then(res => {
          this.chapter = res.data.chapter;
        })
    },
    //弹出添加章节页面
    openChapterDialog(){
      this.dialogChapterFormVisible = true;
      this.chapter.title = '';
      this.chapter.sort = 0;
      this.chapter.id = '';
    },
    //添加章节
    addChapter(){
      this.chapter.courseId = this.courseId;
      chapter.addChapter(this.chapter)
        .then(res => {
          //关闭弹框
          this.dialogChapterFormVisible = false;
          //提示信息
          this.$message({type: 'success', message: '添加章节成功'});
          //刷新页面
          this.getChapterVideo();
        })
    },
    //修改章节的方法
    updateChapter(){
      chapter.updateChapter(this.chapter)
        .then(res => {
          //关闭弹框
          this.dialogChapterFormVisible = false;
          //提示信息
          this.$message({type: 'success', message: '修改章节成功'});
          //刷新页面
          this.getChapterVideo();
        })
    },
    //添加或修改章节
    saveOrUpdate(){
      if(!this.chapter.id){
        this.addChapter();
      }else{
        this.updateChapter();
      }
    },
    //根据课程id查询章节和小节
    getChapterVideo(){
      chapter.getAllChapterVideo(this.courseId)
        .then(res => {
          this.chapterVideoList = res.data.allChapterVideo;
        })
    },
    previous(){
      //跳转到第一步
      this.$router.push({path: '/course/info/' + this.courseId});
    },
    next(){
      //跳转到第三步
      this.$router.push({path: '/course/publish/' + this.courseId});
    }
  }
}
</script>

<style>
  .chanpterList{
   position: relative;
   list-style: none;
   margin: 0;
   padding: 0;
  }
  .chanpterList li{
    position: relative;
  }
  .chanpterList p{
   float: left;
   font-size: 20px;
   margin: 10px 0;
   padding: 10px;
   height: 70px;
   line-height: 50px;
   width: 100%;
   border: 1px solid #DDD;
  }
  .chanpterList .acts {
   float: right;
   font-size: 14px;
  }
  .videoList{
   padding-left: 50px;
  }
  .videoList p{
   float: left;
   font-size: 14px;
   margin: 10px 0;
   padding: 10px;
   height: 50px;
   line-height: 30px;
   width: 100%;
   border: 1px dotted #DDD;
  }
</style>
